Modified slugs

Do these slugs appear safe to shoot through a rifled barrel? I just wanted to gather some opinion before taking the risk. They are 47 grain NSA .303 caliber with a screw threaded into the hollow section.
20221107_214819.jpg


20221107_214824.jpg


20221107_214813.jpg
 
You want extra penetration? Into what? The standard slug will be plenty good for game or pesting you are going to want to do. Adding a mass produced screw into a precision swaged slug just seems gimmickey and probably won't do much for accuracy. You can try shooting groups with and without and see for yourself but I think the screws will upset the flight.
 
You want extra penetration? Into what? The standard slug will be plenty good for game or pesting you are going to want to do. Adding a mass produced screw into a precision swaged slug just seems gimmickey and probably won't do much for accuracy. You can try shooting groups with and without and see for yourself but I think the screws will upset the flight.
For the zombie apocalypse if God forbid I run out of 12 gauge shells! I was thinking of just keeping a handful of them ready to go. Right now I'm right on the verge of supersonic with these 47 grain slugs because I'm running extended hammerspring, so I was thinking it could possibly improve accuracy even. Only one way to find out!